81276855 has 16 divisors (see below), whose sum is σ = 141865344. Its totient is φ = 39406880.

The previous prime is 81276841. The next prime is 81276863. The reversal of 81276855 is 55867218.

It is not a de Polignac number, because 81276855 - 2⁶ = 81276791 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246129 + ... + 246458.

It is an arithmetic number, because the mean of its divisors is an integer number (8866584).

Almost surely, 2^81276855 is an apocalyptic number.

81276855 is a deficient number, since it is larger than the sum of its proper divisors (60588489).

81276855 is a wasteful number, since it uses less digits than its factorization.

81276855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492606.

The product of its digits is 134400, while the sum is 42.

The square root of 81276855 is about 9015.3677129666. The cubic root of 81276855 is about 433.1672660831.

The spelling of 81276855 in words is "eighty-one million, two hundred seventy-six thousand, eight hundred fifty-five".